diff options
Diffstat (limited to '')
| -rw-r--r-- | kexec/arch/arm64/kexec-elf-arm64.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/kexec/arch/arm64/kexec-elf-arm64.c b/kexec/arch/arm64/kexec-elf-arm64.c new file mode 100644 index 0000000..e14f8e9 --- /dev/null +++ b/kexec/arch/arm64/kexec-elf-arm64.c @@ -0,0 +1,170 @@ +/* + * ARM64 kexec elf support. + */ + +#define _GNU_SOURCE + +#include <errno.h> +#include <fcntl.h> +#include <limits.h> +#include <stdlib.h> +#include <linux/elf.h> + +#include "arch/options.h" +#include "crashdump-arm64.h" +#include "kexec-arm64.h" +#include "kexec-elf.h" +#include "kexec-syscall.h" + +int elf_arm64_probe(const char *kernel_buf, off_t kernel_size) +{ + struct mem_ehdr ehdr; + int result; + + result = build_elf_exec_info(kernel_buf, kernel_size, &ehdr, 0); + + if (result < 0) { + dbgprintf("%s: Not an ELF executable.\n", __func__); + goto on_exit; + } + + if (ehdr.e_machine != EM_AARCH64) { + dbgprintf("%s: Not an AARCH64 ELF executable.\n", __func__); + result = -1; + goto on_exit; + } + + result = 0; +on_exit: + free_elf_info(&ehdr); + return result; +} + +int elf_arm64_load(int argc, char **argv, const char *kernel_buf, + off_t kernel_size, struct kexec_info *info) +{ + const struct arm64_image_header *header = NULL; + unsigned long kernel_segment; + struct mem_ehdr ehdr; + int result; + int i; + + if (info->file_mode) { + fprintf(stderr, + "ELF executable is not supported in kexec_file\n"); + + return EFAILED; + } + + result = build_elf_exec_info(kernel_buf, kernel_size, &ehdr, 0); + + if (result < 0) { + dbgprintf("%s: build_elf_exec_info failed\n", __func__); + goto exit; + } + + /* Find and process the arm64 image header. */ + + for (i = 0; i < ehdr.e_phnum; i++) { + struct mem_phdr *phdr = &ehdr.e_phdr[i]; + unsigned long header_offset; + + if (phdr->p_type != PT_LOAD) + continue; + + /* + * When CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET=y the image header + * could be offset in the elf segment. The linker script sets + * ehdr.e_entry to the start of text. + */ + + header_offset = ehdr.e_entry - phdr->p_vaddr; + + header = (const struct arm64_image_header *)( + kernel_buf + phdr->p_offset + header_offset); + + if (!arm64_process_image_header(header)) { + dbgprintf("%s: e_entry: %016llx\n", __func__, + ehdr.e_entry); + dbgprintf("%s: p_vaddr: %016llx\n", __func__, + phdr->p_vaddr); + dbgprintf("%s: header_offset: %016lx\n", __func__, + header_offset); + + break; + } + } + + if (i == ehdr.e_phnum) { + dbgprintf("%s: Valid arm64 header not found\n", __func__); + result = EFAILED; + goto exit; + } + + kernel_segment = arm64_locate_kernel_segment(info); + + if (kernel_segment == ULONG_MAX) { + dbgprintf("%s: Kernel segment is not allocated\n", __func__); + result = EFAILED; + goto exit; + } + + arm64_mem.vp_offset = _ALIGN_DOWN(ehdr.e_entry, MiB(2)); + if (!(info->kexec_flags & KEXEC_ON_CRASH)) + arm64_mem.vp_offset -= kernel_segment - get_phys_offset(); + + dbgprintf("%s: kernel_segment: %016lx\n", __func__, kernel_segment); + dbgprintf("%s: text_offset: %016lx\n", __func__, + arm64_mem.text_offset); + dbgprintf("%s: image_size: %016lx\n", __func__, + arm64_mem.image_size); + dbgprintf("%s: phys_offset: %016lx\n", __func__, + arm64_mem.phys_offset); + dbgprintf("%s: vp_offset: %016lx\n", __func__, + arm64_mem.vp_offset); + dbgprintf("%s: PE format: %s\n", __func__, + (arm64_header_check_pe_sig(header) ? "yes" : "no")); + + /* create and initialize elf core header segment */ + if (info->kexec_flags & KEXEC_ON_CRASH) { + result = load_crashdump_segments(info); + if (result) { + dbgprintf("%s: Creating eflcorehdr failed.\n", + __func__); + goto exit; + } + } + + /* load the kernel */ + if (info->kexec_flags & KEXEC_ON_CRASH) + /* + * offset addresses in elf header in order to load + * vmlinux (elf_exec) into crash kernel's memory + */ + fixup_elf_addrs(&ehdr); + + result = elf_exec_load(&ehdr, info); + + if (result) { + dbgprintf("%s: elf_exec_load failed\n", __func__); + goto exit; + } + + /* load additional data */ + result = arm64_load_other_segments(info, kernel_segment + + arm64_mem.text_offset); + +exit: + reset_vp_offset(); + free_elf_info(&ehdr); + if (result) + fprintf(stderr, "kexec: Bad elf image file, load failed.\n"); + return result; +} + +void elf_arm64_usage(void) +{ + printf( +" An ARM64 ELF image, big or little endian.\n" +" Typically vmlinux or a stripped version of vmlinux.\n\n"); +} |